Which of the following musical instruments did Dwaram Venkataswamy Naidu play?

Violin

The correct answer is Option (1) -Violin

The musical instrument Dwaram Venkataswamy Naidu played is Violin.

Dwaram Venkataswamy Naidu was a renowned violinist and a key figure in popularizing the violin for Carnatic music performances. While other instruments you mentioned (veena, mandolin, nadaswaram) are all classical Indian instruments, Naidu's legacy is particularly tied to the violin.